Shearing and bending machine



Jan. 8, 1957 c. A. BLoMGRs-:N 2,776,694

SHEARING AND BENDING MACHINE Filed Dec. 27, 1952 4 Sheets-Sheet 1 Jan. 8, 1957 c. A. BLOMGREN 2,775,594

s HEARING AND BENDING MACHINE Filed DEO. 27, 1952 4 Sheets-Sheet 2 JNVENTOR. C/Qre/m? A /omg ren "m BY /34 l,

@TEM/M Jan' 8, 1957 c. A. BLOMGREN SHEARING AND BENDING MACHINE 4 Sheets-Sheet 5 Filed Dec. 27. .1952

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Filed Dec. 27. 1952 /NME/v TDF' C/Qrence A/olrggren 'wh/M United States Patent O SHEARING AND BENDING MACHINE Clarence A. Blomgren, Portland, Oreg.

Application December 27, 1952, Serial No. 3295242 8 Claims. (Cl. 153-16) This invention relates to an improved shearing and bending machine for sheet material, :and has particular reference to a machine for forming metal lath into angle pieces to fit the interior corner angles of a room to be plastered.

In preparing a building structure for interior plastering, the material used to support the plaster is usually applied in flat sheets or strips over the studding to define the interior wall surfaces. The corners are formed by bending narrow strips of perforated, expanded metal sheets or wire mesh into a right angle, or L-shape, in cross section, to establish a straight and true interior corner angle at the intersections of adjacent wall surfaces and at the intersections vof'wall and ceiling surfaces. The cutting and forming of such corner pieces by hand is a relatively slow process and involves considerable manual labor, in comparison with the speed with which the artificial latir material may be applied to the flat surfaces. For more expeditious prosecution of the Work, it is desirable to avoid the tedious hand cutting and forming of such corner pieces.

Objects of the invention are, therefore, to provide a machine for shearing and bending the desired corner pieces rapidly and in sufficient quantity to supply the requirements of large scale construction activity; to provide a power driven machine which will operate automatically to shear and bend the metal lath material without manual effort; to provide a machine which will handle either expanded metal sheets or Wire mesh supplied in rolls; to provide a machine which is eifective and reliable in operation; :and to provide a new and improved type of wire mesh for use as metal lath.

The present machine comprises an intermittent feeding mechainsm arranged to feed either fiat sheet or roll material, a transverse shear for cutting olf short lengths of the material, a bending device for forming corner angles in the sheared pieces, ejecting and stacking mechanism for clearing the pieces out of the machine and stacking them neatly and compactly, and novel control mechanism for initiating the various functions of the machine in the proper sequence in a repeating cycle to make a predetermined quantity of corner pieces, and then stop the machine.

These land other objects will be apparent and the invention will be better understood with reference to the accompanying drawings illustrating a preferred embodiment of the machine. It is to be understood, however, that the drawings are intended to illustrate, rather than limit, the invention, that various changes may be made in the construction and arrangement of parts Within the scope of the appended claims, and that certain features may be used without others.

ln the drawings:

Figure l is a longitudinal sectional view through the machine showing ythe parts in normal rest position;

Figure la is a similar view showing the parts in cutting and bending position;

2,776,694 APatented dan. d, iii' ICC Figure 2 is a fragmentary sectional view taken on the line 2-2 of Figure l;

Figure 3 is a side elevation view of the machine, looking in the same direction as in Figure l;

Figure 4 is a fragmentary front elevation View showing certain parts of the operating mechanism appearing in Figure 3;

Figure 4a is a top plan View of the parts shown in Figure 4;

Figure 5 is a fragmentary view, with parts in section, showing a portion of the drive mechanism for the feed roll;

Figure 6 is a cross sectional view of the overrunning clutch of the feed drive mechanism, taken on the line 6--6 of Figure 5;

Figure 7 is a fragmentary plan view, taken on the line 7-7 `of Figure 3, showing two of the control valves and the counting device for the feed mechanism;

Figure 7a is a view of a portion of Figure 7 showing the main supply valve in closed position;

Figure 8 is a rear elevation view illustrating the machine as viewed from the left in Figures l and 3; and

Figure 9 is a perspective view of an improved form of metal lath of the wire mesh type.

Referring rst to Figure l for a general description of the construction and operation 0f the machine, the wire mesh W is drawn by a feed roll 10 from a roll of the mesh supported on a spindle or shaft 11. The mesh is fed in intermittent movement under a vertically movable shear blade l2 and thence under a vertically movable material or work piece clamping member 13, with a free end of the mesh extending a short distance to the left of the clamping member. The extending free end of the mesh thereby overlies a pivotal bending member la which is disposed adjacent the rear side of the clamping member and which is actuated to swing upwardly and fold the desired right angle bend in the mesh to form the corner piece. After actuation of the shear 12 and bending member 14, the clamping member 13 is released and a plurality of ejecting fingers 15 remove the formed corner piece and deposit it on a rack having upstanding arms le, a finished corner piece thus received upon the arm 16 being indicated at C.

When the material is supplied in flat sheets, such as the conventional form of expanded metal lath, instead of in rolled condition, it may be fed from a table adjacent the feed roll 10.

The above mentioned parts of the mechanism are supported upon a base frame 20 having uprights 2l to support the spindle ll for the supply roll and uprights 22 to support the arms 16 of the receiving rack. Legs 23 and 2.4 support the feed roll 1t) and the shearing, bending and ejecting mechanism. Upstanding brackets 25 on the legs 23 are equipped with suitable bearings for the driven shaft 26 of feed roll ill.

The feed roll 10 is equipped with projections 27 pitched to engage the particular material being used without slipping. An upper idle roll 28 holds the mesh in positive driving engagement with the feed roll l0, and a guide roll 29 carried by pivotally mounted arms 3@ engages the wire `mesh between the supply roll and the feed roll 10 to prevent slack in the mesh from looping upwardly when the feed roll stops rotating after each feed movement.

Shear blade i2 is mounted for movement in vertical guides in a pair of upstanding end members 36 at opposite sides of the machine. End members 36 are mounted on a base plate 37 which is supported by the legs 23, 24. The opposite ends of the shear blade 12 are equipped with depending arms 40 pivotally connected with vertical' links 41, which are in turn pivotally connected at their lower ends, respectively, to a pair of arms 42 pivotally mounted on a transverse shaft 43 in the base The shear blade 12 is raised after a cutting operation by a pair of springs 44 which raise the ends of arms 42 until they strike the stops 45. (See Figure 8.) Downward movement of the shear blade 12 to perform the cutting stroke is effected by the action of a vertical iluid pressure cylinder 46 having a piston rod 47 connected with the center of a cross bar 48 which is connected at its ends with the two arms 42. The upper end of cylinder 46 is pivotally mounted at 49 on the under side of base plate 37. Springs 44 are connected between cross bar 48 and brackets 23a on legs 23.

The movable shear blade 12 cooperates with a narrow stationary shear blade or plate 50. The blade 50 has a at horizontal supporting surface 50a and is secured to the top of base plate 37. When the movable shear blade 12 moves downwardly to cut the material, the severed portion of material overlying the stationary blade 58 does not move, but the other portion of the material engaged by the blade 12 is deflected downwardly beneath the blade 12. To allow for this downward movement of the material in each cutting7 operation without sharply bending the material, a material support and guide member 51 is mounted by means of depending brackets 52 on the shear blade 12, as shown in Figure 2, to move downward in unison therewith in each cutting stroke as shown in Figure la. When the shear blade 12 is in its raised position as shown in Figure l, the support and guide member 51 rests on a level with the stationary shear blade Sil and holds the material closely adjacent the under side of an upper stationary guide member 53. Thus, the two guide members 51 and 53 form a narrow horizontal slot, or throat, through which the material is pushed in each feed movement by the feed roll 10. The guide members 51 and 53 thereby hold the freshly cut end of the material liat and in alignment with the horizontal opening, or throat, between clamping member 13 and the stationary shear blade 50.

Clamping member 13 is carried above the supporting surface 50a by a plurality of vertical studs 55 hanging from brackets 56 on the movable shear blade 12. The height of clamping member 13 in its open position may be adjusted by means of nuts 57. When shear blade 12 moves downwardly in a shearing operation, clamping member 13 follows the shear blade downwardly for a short distance until it engages the portion of the material overlying stationary shear blade 50, and then further movement of the blade 12 compresses springs 58 on the studs 55 between clamp member 13 and the horizontal leg of bracket 56 to clamp the material firmly against the stationary blade 50. This clamping action begins in the initial movement of shear blade 12 before the blade engages the material to be cut. Springs 58 provide a resilient connection between the blade 12 and the clamping member 13.

Bending member 14 is normally disposed in horizontal position, as shown in full lines in Figure l, with its top surface extending to the left in the plane of the top surface 50a of stationary blade 50. Each feed movement of the feed roll carries the freshly cut leading edge of the material lto the left approximately to the lefthand edge of the bending member 14. Bending member 14 is pivotally mounted on stub shafts 60 journaled in end members 36, and, concurrently with the shearing operation, the member 14 is swung upwardly from its position in the plane of surface 50a to a perpendicular position confronting a vertically upstanding fiat flange 61 on clamping member 13 to bend the overlying end portion cf the material up against the flange 61, as shown in Figure la, the flange 61 being in perpendicular relation to the surface 50a and being on the side of clamping member 13 remote from the shear blade 12. This 90 degree angular movement of bending member 14 is produced by a pair of lever arms 62 on the stub shafts 60.

4 Links 63 connect these arms with adjustable brackets 64 on the links 41.

Ejector fingers 15 depend from a horizontal shaft 65 supported by brackets 66. The fingers 1S normally repose in vertical grooves 67 in the flange 61, and when the shaft 65 is rotated in a clockwise direction in Figure l the fingers kick the formed corner piece to the left, whereby the piece is engaged by fingers 68 on the upper ends of arms 16, the lingers 68 passing through the mesh of the corner piece and guiding the piece down the arms 16 to collect a plurality of them in a neat stack. Arms 16 are detachably mounted on a cross bar 69 and may be removed therefrom when a stack of corner pieces has been collected. Another set of arms 16 may then be mounted on bar 69.

The feed roll 10 is rotated counterclockwise, as viewed in Figures l and 3, through a partial revolution in each operating cycle by a fluid pressure cylinder 70. The lower end of cylinder 70 is pivotally connected by a pin 71 with a bracket on one of the legs 23. The upper end of piston rod 72 carries a horizontal pin 73 journalled in a bushing 82 which may be clamped by a nut 83 or other suitable means in adjusted position in a slot 74 in a crank arm 75. Arm 75 is secured to a 'stub drive shaft 76 in axial alignment with the feed roll shaft 26 and is pulled downwardly by spring 77 which is connected at its lower end to a bracket 23b. Stub shaft 76 is connected with the outer member 78 of an overrunning clutch unit of conventional construction which has an inner member 79 connected with the feed roll shaft 26, as shown in `Figures 5 and 6. When the arm 75 is rotated counterclockwise by piston rod 72, the balls 80 are wedged into driving connection with the inner member 79 to turn the feed roll 10, but when the arm 75 is returned to its starting position shown in Figure 3, by the action of spring 77, the balls v8i) are moved into the wide ends of recesses 81 to disconnect the feed roll shaft 26 from the stub shaft 76 so that the feed roll is not backed up. The adjustment of bushing 82 in slot 74 provides for increasing the mechanical advantage of piston rod 72 if a material is used requiring more torque in the feed roll 10.

Rotation of feed roll 10 is stopped at the end of each feed movement by a pawl 85 having a tooth S4 which engages stepped notches in a ratchet wheel 86 on the shaft 26. Pawl 85 is urged upwardly against the ratchet Wheel by a spring 87 as shown in Figure 3 but is retracted by a horizontal pin 88 on piston rod 72 at the end of the return stroke of the piston rod, as shown in Figure 4. Spring 87 is a compression spring having one end secured to pawl 85 and its other end secured to a bracket 23C on leg 23.

Ratchet wheel 86 also actuates the ejector fingers 15. Connected with one end of shaft 65 is an arm 90 which is movable by means of push rod 91. The lower end of push rod 91 rides on ratchet wheel S6 and carries a lug 92 which is engaged by one of the notches in the ratchet wheel during the rotation of the ratchet wheel in a feed movement of the feed roll 10. Rotation of ratchet wheel 86 in counterclockwise direction causes one of the notches to engage lug 92 and impart longitudinal movement to push rod 91, until finally the notch leaves lug 92, allowing the push rod and ejecting fingers to return by gravity to their normal position shown in Figure 3. Since the eject ing movement of push rod 91 occurs simultaneously with the feed movement of feed roll 10, the finished piece C is ejected just ahead of the advancing end of the infeeding material W, and then the ejector finger 15 returns just prior to the bending movement of member 14.

Each return movement of piston rod 72 also actuates a push rod 99, connected with pawl 85, into engagement with a toothed counting Wheel 100, advancing the wheel one tooth in a clockwise direction in Figure 3. Counting wheel carries a cam lug 101 to engage and release a valve trip or catch lever 102 mounted on leg 23, as shown in Figures 3, 7 and 7a. Valve trip lever 102 is equipped with a lug 107 normally engaging in the hollow handle 103 of valve 104 to hold the valve open against the closing tension of spring 105. One end of spring 105 is anchored to a bracket 109 on a pipe 110 supporting the valve 104 and the other end is connected with a lug 106 on the handle 103. Before describing' the rest of the control system, it will be explained that the machine is started by manually moving valve handle 103 to its open position shown in Figure 7, and engaging the handle with lug 107 on the valve trip lever 102. Counting wheel 100 is rotatable by hand to a selected position, indicated by suitable indicia, to produce a predetermined number of cycles of operation of the machine. After each feed movement of feed roll 10, the counting wheel 100 is advanced one tooth until finally cam lug 101 engages the lever 102. Upon such engagement the lever 102 is disengaged from valve handle 103, allowing spring 105 to close the valve 104 as shown in Figure 7a and stop the machine. In Figure 7 the lug 101 is approaching but has not yet engaged lever 102.

Still referring to Figure 7, the numeral 110 designates a iuid pressure supply pipe, such as a compressed air pipe, for supplying the operating energy for the machine. When valve 104 is open, fluid pressure is communicated through pipe 111 to a valve 112 connected with the lower end of feed roll actuating cylinder 70. This valve is urged toward closed position by spring 113 having one end connected with the valve operating lever or handle 114. The other end of spring 113 is connected with a bracket 23d on leg 23. Valve lever 114 is moved clockwise in Figure 7 to open position by a push rod 115 which has a lower end disposed adjacent a stop 45 for engagement by one of the arms 42, as shown in Figure 3.

Referring now to Figures 3 and 8, the operation of shear actuating cylinder 46 is controlled by a valve 120 connected with the upper end of the cylinder to admit uid pressure at the proper times from supply pipe 110. This valve, normally closed, is turned to open position by a shaft 121 having a lever 123 connected with a link 122 engaged by a long lever arm 130. Lever arm 130 is pivotally mounted intermediate its ends at 131, having one end engaging the link 122 and the other end equipped with an adjustable striker plate 134 for engagement by each upward feed movement of the arm 75. Arm 75 is adapted to pivot the arm 130 in a counterclockwise direction sufficient to open the valve 120, the return movement of arm 130 being limited by a stop pin 135 on the leg 24.

Figure 9 illustrates a special form of wire mesh which may be used advantageously with the present machine. This mesh has longitudinal wires 150 and transverse wires 151, 152, 153 and 154 which provide rectangular mesh openings. The wires 151 and 154 are spaced more closely together than the other wires, so that when the mesh is sheared transversely on the lines 155, the ends 156 will be relatively short on the nished piece C. The bend is made on the line 160 between the transverse wires 152 and 153. This arrangement of the transverse wires of the mesh makes all the corner pieces uniform and minimizes the length of the cut ends 156, whereas in conventional wire mesh, cut and bent at random, some of the ends 156 may be long and others short, and some of the bends may occur substantially on a transverse wire.

The projections or teeth 27 on feed roll 10 are pitched to tit the mesh shown in Figure 9, and the amount of angular advance in each feed movement of the roll is suicient to feed a length of the mesh equal to the distance between the shear lines 155. The distance between each bend line 160 and the shear line 155 imme` diately therebehind is equal to the distance from the bending corner at the bottom of flange 61 to the cutting edge of stationary shear blade 50 in Figure la.

Operation Figures 1 and 3 illustrate the normal rest positions of the various parts of the mechanism. At such times the valve 112 is held open by reason of the engagement of arm 42 with push rod 115. When it is desired to start the machine in operation, the counting wheel 100 is rotated by hand to a selected position for automatically shutting olf the machine after a predetermined number of cycles of operation. Then, when the valve handle 103 is manually moved to open position and engaged with the release lever 102 to hold it open, fluid pressure is immediately admitted to the lower end of cylinder 70, actuating piston rod 72 to lift arm 75 and rotate feed roll 10 through a predetermined arc of movement which may be lengthened or shortened by adjustment of striker plate 13d, the bushing 82 being disposed a suilicient radial distance from the arm "I6 so that the pin 88 clears the ratchet wheel in the upward movement of arm 75. The upward movement of piston rod 72 rotates the ratchet wheel 86 a slight amount before it is engaged by tooth S4 behind a stepped notch on said wheel S5 whereby this tooth does not interfere with the normal feed movement. lf there is a formed corner piece still in the machine, as would normally be the case after the first cycle of operation, the movement of push rod 91 by ratchet wheel v 36 would actuate the ejecting fingers 15 to eject the place during this brief interval,

finished piece onto the receiving rack arms 16.

The feed movement of feed roll 10 is terminated by tooth 34 on pawl 85 engaging the next notch in ratchet wheel 86. When striker plate 134 is lifted by arm 75, the other end of arm 130 is depressed, pulling downward on link 122 and opening valve 120 to admit iiuid pressure to the upper end of cylinder 46. Piston rod 47is thereupon extended downwardly, depressing the lever arm 42 and moving it away from engagement with the lower end of push rod 115, whereby valve 112 is closed by spring 113, stopping the upward movement of piston rod 72.

The downward movement of lever arm 42 pulls the links ily downwardly, actuating the movable shear blade 12 to cut the material, the clamp member 13 firmly engaging the material during the initial movement of the blade 12 before the blade begins to cut the material. Then, as the blade 12 moves downwardly in its shearing action, the support and guide member 51 are correspond` ingly depressed to avoid sharply bending the freshly cut end of the material. Also, as the blade 12 moves downwardly, links 63 rotate the bending member 14 upwardly to bend the necessary right angle into the sheared piece.

By reason of the fact that the valve 120 is connected directly with the cylinder 46, the action of piston rod 47 is rapid, and its downward stroke is completed before the arm has backed away from striker plate 134 to close the valve 120. As soon as valve 120 is closed, springs 44 return the lever arms 42 to their rest position shown in Figures 'l and 3, lifting the blade 12 and clamping member 13 to release the finished piece for subsequent ejection and to release the cut end of the material for subsequent feed movement. Support and guide member 51 raises the cut end of the material into position to pass across stationary blade 50 and base plate 3'7.

While piston rod 47 is being retracted upwardly by springs 44 the piston rod 72 is retracted downwardly by spring 77. Approaching the limit of downward movement of piston rod 72 the pin 88 depresses pawl lever releasing ratchet wheel 86 and actuating the counting Wheel push rod 99. During the return movement of crank arm 75 reverse rotation of feed roll 10 is prevented by roll friction and the stiffness of the material W which is bent around the roll and frictionally engaged with the lower edge of blade 12 as shown in Figure la. Guide roll 29 does not have sufficient Weight to pull the cut end of the material out of the machine against the bending friction and surface friction which tend to hold it in At the end of the return movement of crank arm 75 the overrunning clutch 78 positively prevents reverse rotation of the feed roll.

The return of arms 42 to engagement with stops 45 again moves the push rod 115 to free the valve 112 for actuation and initiate the next cycle of operation, at the beginning of which cycle the previously completed corner piece is ejected by the lingers 15, as hereinabove described. The machine thus continues in operation until the cam lug 101 on counting wheel 100 engages release lever 102, allowing spring 105 to close valve 104 and shut olf the iluid pressure supply to feed cylinder it?.

Having now described my invention and in what manner the same may be used, what I claim as new and desire to protect by Letters Patent, is:

l. A shearing and bending machine for forming angle pieces from llat sheet or mesh material comprising a stationary shear blade having a liat narrow supporting surface extending the width of said material, a clamping member above said surface having an upstanding frange perpendicular to said surface, a bending member pivotally mounted at one side of said clamping member for movement from a position in the plane of said supporting surface to a perpendicular position confronting said flange, a movable shear blade associated with said stationary shear blade, a resilient connection between said movable shear blade and said clamping member to clamp said sheet on said supporting surface when said movable shear blade is operated, a lever on said bending member, and a link operably connecting said lever with said movable shear blade.

2. A shearing and bending machine for forming angle pieces from at sheet or mesh material comprising a stationary shear blade having a horizontal sheet supporting surface, a movable shear blade mounted in vertical guides for cooperation with said stationary shear blade, a clamping member resiliently mounted on said movable shear blade and disposed above said supporting surface to clamp a work piece on said surface when said shear blade is actuated downwardly in a shearing operation, a vertical flange on said clamping member on the side remote from said shear blade, a bending member pivotally mounted for movement from a position in the plane of said supporting surface to a perpendicular position confronting said llange, a lever on said bending member, a link operably connecting said lever with said movable shear blade, and a vertical cylinder and piston rod unit operably connected with said movable shear blade for imparting a cutting stroke thereto.

3. A shearing and bending machine for forming angle pieces from at sheet or mesh material comprising a stationary shear blade having a flat supporting surface, a movable shear blade cooperating with said stationary shear blade, a material clamping member disposed in clamping relation with said supporting surface and resiliently mounted on said movable shear blade, a flat grooved member disposed perpendicular to said supporting surface at the other side thereof, ejector lingers normally disposed against said perpendicular member in said grooves and mounted for movement away from said member, a bending member pivotally mounted adjacent said perpendicular member for movement from a position in the plane of said supporting surface to a perpendicular position confronting said perpendicular member, means operable by said movable shear blade for swinging said bending member in said movement, a feed mechanism for feeding material between said shear blades and between said supporting surface and clamping member, and means operated by said feed mechanism for actuating said ejector lingers.

4. A shearing and bending machine for forming angle pieces from iiat sheet or mesh material comprising stationary and movable shear blades, a material support mounted on one side of said movable shear blade for movement in unison with said blade, a clamping member resiliently mounted on the other side of said movable shear blade for movement in unison with said blade, said stationary shear blade having a flat supporting surface engageable by said clamping member, a member extending perpendicular to said supporting surface at one side of said clamping member remote from said blades, and a bending member pivotally mounted for movement from a position in the plane of said supporting surface to a perpendicular position confronting said perpendicular member.

5. A shearing and bending machine for forming angle pieces from fiat sheet or mesh material comprising stationary and movable shear blades, means for operating said movable shear blade, brackets on one side of said movable shear blade rigidly mounting a material support For movement in unison with said shear blade, brackets on the other side of said movable shear blade resiiiently mounting a clamping member for movement in unison with said shear blade, said stationary shear blade having a supporting surface engageable by said clamping member, a member extending perpendicular to said clamping member and supporting surface, a bending member pivotally mounted for movement from a position in the plane of said supporting surface to a perpendicular position confronting said perpendicular member, a lever arm on said bending member, and a link on said lever arm connected with said operating means.

6. A shearing and bending machine for forming angle pieces from flat sheet or mesh material comprising a plate having a fiat material supporting surface, a movable shear blade at one side of said surface, a clamping member operable by said shear blade for movement into clamping relation with material on said supporting surface, a fiat member extending perpendicular to said supporting surface, a bending member pivotally mounted for movement from a position in the plane of said supporting surface to a perpendicular position confronting said perpendicular member, a liuid pressure cylinder having a piston rod operably connected with said shear blade, means operably connecting said bending member with said shear blade and piston rod, a feed roll mounted on a shaft for feeding said material across said supporting surface, a drive shaft connected with said roll shaft through an overrunuing clutch, a crank arm on said drive shaft, a fluid pressure cylinder having a piston rod connected with said crank arm for rotating said feed roll, a valve operable by rotation of said drive shaft controlling the operation of said shear blade cylinder and piston rod, and a valve freed for actuation by movement of said shear blade controlling the operation of said feed roll cyclinder and piston rod.

7. A shearing and bending machine for forming angle pieces from flat sheet or mesh material comprising a plate having a flat material supporting surface, a movable shear blade at one side of said surface, a clamping member operable by said shear blade for movement into clamping relation with material on said supporting surface, a member extending perpendicular to said supporting surface, a bending member pivotally mounted for movement from a position in the plane of said supporting surface to a perpendicular position confronting said perpendicular member, a lluid pressure cylinder having a piston rod operably connected with said shear blade, means operably connecting said bending member with said shear blade and piston rod, a feed roll mounted on a shaft for feeding said material across said supporting surface, a drive shaft connected with said roll shaft through an overrunning clutch, a crank arm on said drive shaft, a fluid pressure cylinder having a piston rod connected with said crank arm for rotating said feed roll, a valve operable by rotation of said drive shaft controlling the operation of said shear blade cylinder and piston rod, a valve freed for actuation by movement of said shear blade controlling the operation of said feed roll cylinder and piston rod, a liuid pressure supply pipe for said feed roll cylinder and valve, a spring operated valve in said pipe biased toward closed position, a catch member holding said valve in open position, a toothed counting wheel mounted for rotation to a predetermined position to release said catch member, a member engageable with a tooth of said counting wheel and movable through a stroke to rotate said wheel through a predetermined angle, and means connected with said feed roll piston rod for actuating said tooth engaging member whereby said machine will continue in repeated automatic operation until said supply pipe valve is shut off by said counting wheel.

8. A shearing and bending machine for forming angle pieces from flat sheet or mesh material comprising a plate having a at material supporting surface, a movable shear blade at one side of said surface, a clamping member operable by said shear blade for movement into clamp,- ing relation with said supporting surface, a member eX- tending perpendicular to said supporting surface, a bending member pivotally mounted for movement from a posi- Jtion in the plane of said supporting surface to a perpendic ular position confronting said perpendicular member, a shear cylinder and piston rod unit operably connected with said shear blade and bending member, a Valve controlling the operation of said unit, a feed roll mounted on a shaft for feeding material into the machine, a drive shaft connected with said feed roll shaft through an overrunning clutch, means operable by rotation of one of said shafts to actuate said valve, a crank arm on said drive shaft, a feed cylinder and piston rod unit connected with said crank arm, a valve controlling the operation` of said feed cylinder, means controlled by the position of said shear blade to open said feed cylinder control valve when said shear blade is in full open position and to close said valve in other positions of said blade, a uid pressure supply pipe for said feed cylinder and valve, a valve in said supply pipe spring biased to closed position, a catch member arranged to hold said valve in open position, a toothed ratchet wheel for releasing said catch member after a predetermined angle of rotation, a push rod en-v gageable with said ratchet wheel, and means operableby said feed roll piston rod to actuate said push rod whereby v 10 said machine will continue in automatic operation until said supply pipe valve is released to closed position by said ratchet wheel after a predetermined number of cycles of operation.

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